Development of an improved design of a high-capacity passenger railcar for the railways of Uzbekistan

In the context of the rapid growth of passenger traffic by rail, one of the priorities is to increase the efficiency of rolling stock use. The key direction in solving this problem is to increase the passenger capacity of railway coaches while ensuring a high level of their structural strength, reliability and safety. This study presents an improved design of the body of a passenger coach with increased capacity, developed taking into account modern requirements for comfort, environmental friendliness and operational efficiency. To assess the design characteristics, a comprehensive analysis was carried out, including theoretical calculations of the stress-strain state of the body elements using the finite element method. Numerical modeling made it possible to identify critical areas of the structure and optimize its parameters to increase strength and reduce material consumption. The simulation results were supplemented and confirmed by experimental tests of the prototype, conducted in conditions as close as possible to real operation. The data obtained indicate that the design meets the requirements of current regulatory documents, including safety and durability standards. The proposed design demonstrates improved operational characteristics, which makes it promising for use in the design and modernization of new-generation passenger coaches. The research results can serve as a basis for further developments in the fi eld of innovative railway transport, providing an increased level of comfort and efficiency.

1. Boronenko Yu.P., Rahimov R.V. Assessment of the Need for New Passenger Railcars for the Railways of Uzbekistan and Key Directions for Their Improvement. Bulletin of TashIIT. 2009;2:88-91. EDN CFLXCK. (In Russ.).

2. Rahimov R.V. The First Uzbek Long-Distance Passenger Railcar. Heavy Engineering. 2010;6:34-35. EDN MSNWLN. (In Russ.).

3. Shinkaruk A.S. Technical Preparation for Scheduled Preventive Maintenance of Double-Decker Rolling Stock. World of Transport and Transportation. 2023;21(4):53-61. (In Russ.).

4. Kammer R. Double-Decker Passenger Railcars of the German Railways. World Railways. 2008;12:34-39. (In Russ.).

5. Kallee S.W., Davenport J. Trends in Design and Fabrication of Rolling Stock. European Railway Review. 2007;1:75-79.

6. Lovska A., Gerlici J., Dižo J. Research of the possibility of using beams with corrugated walls in a passenger rail car frame. Scientific Reports. 2025;15:26833. DOI: 10.1038/s41598-025-12783-0.

7. Lovska A., Stanovska I., Nerubatskyi V., Hordiienko D., Zinchenko O., Karpenko N., Semenenko Y. Determining features of the stressed state of a passenger car frame with an energy-absorbing material in the girder beam. Eastern-European Journal of Enterprise Technologies. 2022;5(7(119)):44-53. DOI: 10.15587/1729-4061.2022.265043. EDN JIMGDC.

8. Zairova D., Kadirov M., Khojiev N., Khikmatov F., Shokuchkorov K. Running quality assessment of a passenger car produced in the Republic of Uzbekistan. E3S Web of Conferences. 2021;264:05058. DOI: 10.1051/e3sconf/202126405058. EDN VMECOJ.

9. Martynov I., Kalabuxin Y., Trufanova A., Martynov S. Analysis of passenger cars failures. Municipal Economy of Cities. 2024;6(187):289-294. DOI: 10.33042/2522-1809-2024-6-187-289- 294. EDN BZSIMO.

10. Kirkpatrick S.W., MacNeill R.A. Development of a computer model for prediction of collision response of a railroad passenger car. ASME/IEEE Joint Railroad Conference. 2002:9-16. DOI: 10.1109/RRCON.2002.1000085.

11. Lan Q., Song F. Fatigue simulation of railway car bogie frame based on multi-body dynamics and fi nite element analysis. Journal of Physics: Conference Series. 2021;1885:042057. DOI: 10.1088/1742-6596/1885/4/042057. EDN YXUXBS.

12. Xie N., Lu Y.-H., Feng Z., Chen T.-L. Fatigue strength research on aluminum alloy car body for railway vehicle based on finite element analysis method. Proceedings of the International Conference on Material Science and Applications. 2015:885-891. DOI: 10.2991/icmsa-15.2015.164.

13. Sun W., Zhou J., Gong D., You T. Analysis of modal frequency optimization of railway vehicle car body. Advances in Mechanical Engineering. 2016;8(4):1-12. DOI: 10.1177/1687814016643640.

14. Jin X., Guo F. Fatigue research of metro car body based on operational loads. Railway Sciences. 2024;3(5):558-574. DOI: 10.1108/RS-06-2024-0023. EDN BLZJIS.

15. Baykasoglu C., Sunbuloglu E., Bozdag S.E., Aruk F., Toprak T., Mugan A. Numerical static and dynamic stress analysis on railway passenger and freight car models. International Iron & Steel Symposium. 2012. Karabük, Türkiye:579-586.

16. Rahimov R.V. A new compartment-type passenger railcar for the railways of Uzbekistan. Proceedings of PGUPS. 2010;2:286- 295. (In Russ.).